Getting one shotted by falling demons

You know the demons that show up like a meteor...I've been one shotted 3 times tonight playing my WD in T5. With 1500-1700 AR and 450k HP, 6300 armor. No warning just ( pew pew demons fall from the sky like meteor) BOOM dead. The sound effect is at the same moment they fall. One other time I managed to move fast enough, but generally theres no warning and its a one shot.WTF is that?

Stupid. Lazy game design with no thought. Please do something about this.

I think there are enough concerns in this thread alone to merit an inquiry. It's kind of late at the moment, but I'll see what I can find out. Thank you all for weighing in on this, and for the reports!